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diff --git a/CHANGES.txt b/CHANGES.txt index 0d4ce0ec..ac42aa5a 100644 --- a/CHANGES.txt +++ b/CHANGES.txt @@ -1,3 +1,85 @@ +2015-02-26 version 3.0.0-alpha-2 (Python/Ruby/JavaNano): + General + * Introduced three new language implementations (Ruby, JavaNano, and + Python) to proto3. + * Various bug fixes since 3.0.0-alpha-1 + + Python: + Python has received several updates, most notably support for proto3 + semantics in any .proto file that declares syntax="proto3". + Messages declared in proto3 files no longer represent field presence + for scalar fields (number, enums, booleans, or strings). You can + no longer call HasField() for such fields, and they are serialized + based on whether they have a non-zero/empty/false value. + + One other notable change is in the C++-accelerated implementation. + Descriptor objects (which describe the protobuf schema and allow + reflection over it) are no longer duplicated between the Python + and C++ layers. The Python descriptors are now simple wrappers + around the C++ descriptors. This change should significantly + reduce the memory usage of programs that use a lot of message + types. + + Ruby: + We have added proto3 support for Ruby via a native C extension. + + The Ruby extension itself is included in the ruby/ directory, and details on + building and installing the extension are in ruby/README.md. The extension + will also be published as a Ruby gem. Code generator support is included as + part of `protoc` with the `--ruby_out` flag. + + The Ruby extension implements a user-friendly DSL to define message types + (also generated by the code generator from `.proto` files). Once a message + type is defined, the user may create instances of the message that behave in + ways idiomatic to Ruby. For example: + + - Message fields are present as ordinary Ruby properties (getter method + `foo` and setter method `foo=`). + - Repeated field elements are stored in a container that acts like a native + Ruby array, and map elements are stored in a container that acts like a + native Ruby hashmap. + - The usual well-known methods, such as `#to_s`, `#dup`, and the like, are + present. + + Unlike several existing third-party Ruby extensions for protobuf, this + extension is built on a "strongly-typed" philosophy: message fields and + array/map containers will throw exceptions eagerly when values of the + incorrect type are inserted. + + See ruby/README.md for details. + + JavaNano: + JavaNano is a special code generator and runtime library designed especially + for resource-restricted systems, like Android. It is very resource-friendly + in both the amount of code and the runtime overhead. Here is an an overview + of JavaNano features compared with the official Java protobuf: + + - No descriptors or message builders. + - All messages are mutable; fields are public Java fields. + - For optional fields only, encapsulation behind setter/getter/hazzer/ + clearer functions is opt-in, which provide proper 'has' state support. + - For proto2, if not opted in, has state (field presence) is not available. + Serialization outputs all fields not equal to their defaults. + The behavior is consistent with proto3 semantics. + - Required fields (proto2 only) are always serialized. + - Enum constants are integers; protection against invalid values only + when parsing from the wire. + - Enum constants can be generated into container interfaces bearing + the enum's name (so the referencing code is in Java style). + - CodedInputByteBufferNano can only take byte[] (not InputStream). + - Similarly CodedOutputByteBufferNano can only write to byte[]. + - Repeated fields are in arrays, not ArrayList or Vector. Null array + elements are allowed and silently ignored. + - Full support for serializing/deserializing repeated packed fields. + - Support extensions (in proto2). + - Unset messages/groups are null, not an immutable empty default + instance. + - toByteArray(...) and mergeFrom(...) are now static functions of + MessageNano. + - The 'bytes' type translates to the Java type byte[]. + + See javanano/README.txt for details. + 2014-12-01 version 3.0.0-alpha-1 (C++/Java): General |